Three cases of solid and papillary epithelial neoplasm of the pancreas are presented. These tumors occur more commonly in young patients with a predilection for young black females. They have a good prognosis allowing conservative surgery. The histological study of the specimens strongly suggests an endocrine tumor but all histological and immunocytochemical endocrine stains are negative. The ultrastructural study of these tumors has revealed the existence of borderline forms between these tumors and endocrine tumors.